Officials at wugang , the nearest town , say they did not know the smelter existed .
武冈市官员表示，他们不知道有这家锰冶炼厂存在。
Chinalco , the largest aluminium group , is investing in a new smelter in malaysia and exploring the potential for developing bauxite mines and other facilities in guinea .
But a recent visitor found children still playing in the streets of one village literally in the shadow of a privately-owned lead smelter that nightly belches plumes of dark smoke .
